224 lines
7.2 KiB
C
224 lines
7.2 KiB
C
/*
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* vimc-common.h Virtual Media Controller Driver
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*
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* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _VIMC_COMMON_H_
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#define _VIMC_COMMON_H_
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#include <linux/slab.h>
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#include <media/media-device.h>
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#include <media/v4l2-device.h>
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/* VIMC-specific controls */
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#define VIMC_CID_VIMC_BASE (0x00f00000 | 0xf000)
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#define VIMC_CID_VIMC_CLASS (0x00f00000 | 1)
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#define VIMC_CID_TEST_PATTERN (VIMC_CID_VIMC_BASE + 0)
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#define VIMC_FRAME_MAX_WIDTH 4096
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#define VIMC_FRAME_MAX_HEIGHT 2160
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#define VIMC_FRAME_MIN_WIDTH 16
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#define VIMC_FRAME_MIN_HEIGHT 16
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#define VIMC_FRAME_INDEX(lin, col, width, bpp) ((lin * width + col) * bpp)
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/**
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* struct vimc_colorimetry_clamp - Adjust colorimetry parameters
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*
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* @fmt: the pointer to struct v4l2_pix_format or
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* struct v4l2_mbus_framefmt
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*
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* Entities must check if colorimetry given by the userspace is valid, if not
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* then set them as DEFAULT
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*/
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#define vimc_colorimetry_clamp(fmt) \
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do { \
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if ((fmt)->colorspace == V4L2_COLORSPACE_DEFAULT \
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|| (fmt)->colorspace > V4L2_COLORSPACE_DCI_P3) { \
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(fmt)->colorspace = V4L2_COLORSPACE_DEFAULT; \
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(fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; \
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(fmt)->quantization = V4L2_QUANTIZATION_DEFAULT; \
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(fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
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} \
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if ((fmt)->ycbcr_enc > V4L2_YCBCR_ENC_SMPTE240M) \
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(fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; \
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if ((fmt)->quantization > V4L2_QUANTIZATION_LIM_RANGE) \
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(fmt)->quantization = V4L2_QUANTIZATION_DEFAULT; \
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if ((fmt)->xfer_func > V4L2_XFER_FUNC_SMPTE2084) \
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(fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
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} while (0)
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/**
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* struct vimc_platform_data - platform data to components
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*
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* @entity_name: The name of the entity to be created
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*
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* Board setup code will often provide additional information using the device's
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* platform_data field to hold additional information.
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* When injecting a new platform_device in the component system the core needs
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* to provide to the corresponding submodules the name of the entity that should
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* be used when registering the subdevice in the Media Controller system.
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*/
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struct vimc_platform_data {
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char entity_name[32];
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};
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/**
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* struct vimc_pix_map - maps media bus code with v4l2 pixel format
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*
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* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
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* @bbp: number of bytes each pixel occupies
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* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
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*
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* Struct which matches the MEDIA_BUS_FMT_* codes with the corresponding
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* V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
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*/
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struct vimc_pix_map {
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unsigned int code;
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unsigned int bpp;
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u32 pixelformat;
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bool bayer;
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};
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/**
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* struct vimc_ent_device - core struct that represents a node in the topology
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*
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* @ent: the pointer to struct media_entity for the node
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* @pads: the list of pads of the node
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* @process_frame: callback send a frame to that node
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* @vdev_get_format: callback that returns the current format a pad, used
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* only when is_media_entity_v4l2_video_device(ent) returns
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* true
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*
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* Each node of the topology must create a vimc_ent_device struct. Depending on
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* the node it will be of an instance of v4l2_subdev or video_device struct
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* where both contains a struct media_entity.
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* Those structures should embedded the vimc_ent_device struct through
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* v4l2_set_subdevdata() and video_set_drvdata() respectivaly, allowing the
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* vimc_ent_device struct to be retrieved from the corresponding struct
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* media_entity
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*/
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struct vimc_ent_device {
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struct media_entity *ent;
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struct media_pad *pads;
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void * (*process_frame)(struct vimc_ent_device *ved,
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const void *frame);
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void (*vdev_get_format)(struct vimc_ent_device *ved,
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struct v4l2_pix_format *fmt);
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};
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/**
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* vimc_pads_init - initialize pads
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*
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* @num_pads: number of pads to initialize
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* @pads_flags: flags to use in each pad
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*
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* Helper functions to allocate/initialize pads
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*/
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struct media_pad *vimc_pads_init(u16 num_pads,
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const unsigned long *pads_flag);
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/**
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* vimc_pads_cleanup - free pads
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*
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* @pads: pointer to the pads
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*
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* Helper function to free the pads initialized with vimc_pads_init
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*/
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static inline void vimc_pads_cleanup(struct media_pad *pads)
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{
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kfree(pads);
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}
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/**
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* vimc_pipeline_s_stream - start stream through the pipeline
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*
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* @ent: the pointer to struct media_entity for the node
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* @enable: 1 to start the stream and 0 to stop
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*
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* Helper function to call the s_stream of the subdevices connected
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* in all the sink pads of the entity
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*/
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int vimc_pipeline_s_stream(struct media_entity *ent, int enable);
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/**
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* vimc_pix_map_by_index - get vimc_pix_map struct by its index
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*
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* @i: index of the vimc_pix_map struct in vimc_pix_map_list
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*/
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const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i);
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/**
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* vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
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*
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* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
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*/
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const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
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/**
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* vimc_pix_map_by_pixelformat - get vimc_pix_map struct by v4l2 pixel format
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*
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* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
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*/
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const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
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/**
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* vimc_ent_sd_register - initialize and register a subdev node
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*
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* @ved: the vimc_ent_device struct to be initialize
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* @sd: the v4l2_subdev struct to be initialize and registered
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* @v4l2_dev: the v4l2 device to register the v4l2_subdev
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* @name: name of the sub-device. Please notice that the name must be
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* unique.
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* @function: media entity function defined by MEDIA_ENT_F_* macros
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* @num_pads: number of pads to initialize
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* @pads_flag: flags to use in each pad
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* @sd_ops: pointer to &struct v4l2_subdev_ops.
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*
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* Helper function initialize and register the struct vimc_ent_device and struct
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* v4l2_subdev which represents a subdev node in the topology
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*/
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int vimc_ent_sd_register(struct vimc_ent_device *ved,
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struct v4l2_subdev *sd,
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struct v4l2_device *v4l2_dev,
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const char *const name,
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u32 function,
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u16 num_pads,
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const unsigned long *pads_flag,
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const struct v4l2_subdev_ops *sd_ops);
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/**
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* vimc_ent_sd_unregister - cleanup and unregister a subdev node
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*
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* @ved: the vimc_ent_device struct to be cleaned up
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* @sd: the v4l2_subdev struct to be unregistered
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*
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* Helper function cleanup and unregister the struct vimc_ent_device and struct
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* v4l2_subdev which represents a subdev node in the topology
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*/
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void vimc_ent_sd_unregister(struct vimc_ent_device *ved,
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struct v4l2_subdev *sd);
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/**
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* vimc_link_validate - validates a media link
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*
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* @link: pointer to &struct media_link
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*
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* This function calls validates if a media link is valid for streaming.
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*/
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int vimc_link_validate(struct media_link *link);
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#endif
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